Mack Investment Securities, Inc. is an SEC registered investment adviser organized as a corporation with a primary office location in Northfield, IL. Its latest Form ADV filing, dated March 31, 2026, reports $303M in regulatory assets under management, 8 employees, 1 office, and 1,017 accounts.
Assets Under Management
$303M
Employees
8
Offices
1 office
Total Clients
673
Primary office
NORTHFIELD, IL
211 WAUKEGAN ROAD, STE 300, NORTHFIELD, IL, United States
Portfolio management for individuals and small businesses
Fee models offered
4 types reported
Asset based fees
Commissions
Fixed fees
Sources checked May 13, 2026
Client Coverage Demographics
Top client segmentIndividuals represent 56.3% of total clients.
Top client categories% of clientsClients
1
Individuals
56.3%
379
2
HNWI
41.9%
282
3
Pension Plans
1.8%
12
Regulatory Assets Under Management Breakdown
Total regulatory assets under management$303Mas of March 31, 2026
Discretionary70.9%
$215M
71% of total RAUM70.9%
Non-discretionary29.1%
$88M
29% of total RAUM29.1%
Regulatory assets under management are split between discretionary and non-discretionary assets.
Assets under management Growth by Quarter
Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.
Latest AUM$303M
Total Accounts1,017
10Y AUM Change+$159M (+111.2%)
Employee Growth by Quarter
Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.
Total Employees8
Clients per Employee84:1
10Y Employee Change+1 (+14.3%)
* Metrics are based on the latest available data, including Form ADV filings, brochures, and relationship summaries pulled from the SEC IAPD, and may be subject to change. Learn what is included in the Rialytix data. Please refer to the firm's official disclosures for the most accurate information using their CRD number. This is not investment advice.